Tire Size Calculator

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Stock Sizes

  • 255/75-16

Plus Sizes

  • 255/75-16

Accepts P-Metric and Inches
/ R
/ R
235/80r17 vs 275/70r17 Tire Comparison Side By Side
  235/80-17 275/70-17 Difference
Diameter inches (mm) 31.8 (807.8) 32.16 (816.8) 0.35 (9) 1.1%
Width inches (mm) 9.25 (235) 10.83 (275) 1.57 (40) 17%
Circum. inches (mm) 99.91 (2537.78) 101.03 (2566.05) 1.11 (28.27) 1.1%
Sidewall Height inches (mm) 7.4 (188) 7.58 (192.5) 0.18 (4.5) 2.4%
Revolutions per mile (km) 634.15 (394.04) 627.17 (389.7) -6.99 (-4.34) -1.1%

Speedometer Difference

Speedo Reading Actual Speed
20 mph (32.19 km/h)20.22 mph (32.55 km/h)
25 mph (40.23 km/h)25.28 mph (40.68 km/h)
30 mph (48.28 km/h)30.33 mph (48.82 km/h)
35 mph (56.33 km/h)35.39 mph (56.95 km/h)
40 mph (64.37 km/h)40.45 mph (65.09 km/h)
45 mph (72.42 km/h)45.5 mph (73.23 km/h)
50 mph (80.47 km/h)50.56 mph (81.36 km/h)
55 mph (88.51 km/h)55.61 mph (89.5 km/h)
60 mph (96.56 km/h)60.67 mph (97.64 km/h)
65 mph (104.61 km/h)65.72 mph (105.77 km/h)
70 mph (112.65 km/h)70.78 mph (113.91 km/h)
75 mph (120.7 km/h)75.84 mph (122.05 km/h)
80 mph (128.75 km/h)80.89 mph (130.18 km/h)
85 mph (136.79 km/h)85.95 mph (138.32 km/h)
90 mph (144.84 km/h)91 mph (146.45 km/h)
95 mph (152.89 km/h)96.06 mph (154.59 km/h)
100 mph (160.93 km/h)101.11 mph (162.73 km/h)

Gear Ratio / RPMs for New Tire (@ 65 mph)
2.35 2.73 2.94 3.07 3.21 3.31 3.42 3.55 3.73 3.91 4.11 4.27 4.56 4.88 5.13 5.29 5.38 5.71 6.17 7.17
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